April 16, 2012

CAS databases provide millions of journal article references from more than 10,000 major scientific journals worldwide, patent and patent family references from 63 patent authorities around the world, and other reputable web sources.

The following patent record is from the CAplusSM database.


Patent Number: US 8124761
Title: Processes for the preparation of azoxystrobin and its analog by etherification of the corresponding 6-chloropyrimidine with 2-cyanophenol or its potassium salt in the presence of small amount of DABCO
Inventor(s): Whitton, Alan John; Boyd, Ewan Campbell; Vass, Jack
Patent Assignee(s): Syngenta Limited, UK
Source: PCT Int. Appl., 33 pp. CODEN: PIXXD2
Language: English


The present invention relates to processes for preparing azoxystrobin (I, W = (E)-C(CO2CH3)=CHOCH3) and its analog I (W = C(CO2CH3)CH(OCH3)2) or their mixture, which comprises either (a) reacting the corresponding chloride II (W = same as above) with 2-cyanophenol or a salt thereof, or (b) reacting III with the corresponding phenol IV (W = same as above), both in the presence of between 0.1 and 2 mol % of 1,4-diazabicyclo[2.2.2]octane (DABCO).  The first method was detailed, and it was demonstrated that small amount of DABCO is enough for the high yield.  Effects of solvent and adding sequence on the yield were investigated.  Preparation of phenol IV (W = (E)-C(CO2CH3)=CHOCH3) used in the second method was described, and an involving intermediate, Me 2-(2-benzyloxy)phenyl-3,3-dimethoxypropanoate, is claimed.

Please note:  Abstracts and titles for patent records in CAplus are routinely enhanced to better describe the claimed invention. In this example, CAS enhanced the abstract and title using additional information found in the patent. The title of the U.S. granted patent is Processes for the preparation of azoxystrobin using dabco as a catalyst and novel intermediates used in the processes.


View the full-text U.S. patent from USPTO.

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